Growing community of inventors

Leeds, United Kingdom

David John Howard Roberts

Average Co-Inventor Count = 7.00

ph-index = 1

The patent ph-index is calculated by counting the number of publications for which an author has been cited by other authors at least that same number of times.

Forward Citations = 4

David John Howard Roberts ↔ John Griffiths (1 patent)David John Howard Roberts ↔ Stanley Beames Brown (1 patent)David John Howard Roberts ↔ Kirste Joanne Mellish (1 patent)David John Howard Roberts ↔ Cassandra Claire O'Grady (1 patent)David John Howard Roberts ↔ David Ian Vernon (1 patent)David John Howard Roberts ↔ Richard George Tunstall (1 patent)David John Howard RobertsDavid John Howard Roberts (1 patent)John GriffithsJohn Griffiths (19 patents)Stanley Beames BrownStanley Beames Brown (7 patents)Kirste Joanne MellishKirste Joanne Mellish (5 patents)Cassandra Claire O'GradyCassandra Claire O'Grady (5 patents)David Ian VernonDavid Ian Vernon (5 patents)Richard George TunstallRichard George Tunstall (1 patent)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Photopharmica Limited (1 from 8 patents)


1 patent:

1. 7732439 - Biologically active methylene blue derivatives

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as of
12/8/2025
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